package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.dto.*;
import com.sky.entity.AddressBook;
import com.sky.entity.OrderDetail;
import com.sky.entity.Orders;
import com.sky.entity.ShoppingCart;
import com.sky.exception.AddressBookBusinessException;
import com.sky.exception.OrderBusinessException;
import com.sky.exception.ShoppingCartBusinessException;
import com.sky.mapper.AddressBookMapper;
import com.sky.mapper.OrderDetailMapper;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.result.PageResult;
import com.sky.result.Result;
import com.sky.service.OrderService;
import com.sky.vo.OrderStatisticsVO;
import com.sky.vo.OrderSubmitVO;
import com.sky.vo.OrderVO;
import com.sky.websocket.WebSocketServer;
import io.jsonwebtoken.lang.Collections;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service

public class OrderServiceImpl implements OrderService {

    @Autowired
    private OrderMapper orderMapper;

    @Autowired
    private AddressBookMapper addressBookMapper;

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private OrderDetailMapper orderDetailMapper;

    @Autowired
    private WebSocketServer webSocketServer;

    /**
     * 用户下单
     * @param ordersSubmitDTO
     * @return
     */
    @Override
    @Transactional
    public OrderSubmitVO submitOrder(OrdersSubmitDTO ordersSubmitDTO) {

        //处理业务异常（地址簿为空，购物车数据为空）
        AddressBook addressBook=addressBookMapper.getById(ordersSubmitDTO.getAddressBookId());
        if(addressBook == null){
            throw new AddressBookBusinessException(MessageConstant.ADDRESS_BOOK_IS_NULL);
        }

        Long userId= BaseContext.getCurrentId();
        ShoppingCart shoppingCart=new ShoppingCart();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if(list == null || list.size() == 0){
            throw new ShoppingCartBusinessException(MessageConstant.SHOPPING_CART_IS_NULL);
        }

        //订单表插入一条数据
        Orders orders = new Orders();
        BeanUtils.copyProperties(ordersSubmitDTO,orders);
        orders.setOrderTime(LocalDateTime.now());
        orders.setPayStatus(Orders.UN_PAID);
        orders.setStatus(Orders.PENDING_PAYMENT);
        orders.setNumber(String.valueOf(System.currentTimeMillis()));
        orders.setPhone(addressBook.getPhone());
        orders.setConsignee(addressBook.getConsignee());
        orders.setUserId(userId);

        orderMapper.insert(orders);

        List<OrderDetail> orderDetailList = new ArrayList<>();
        //订单明细表插入n条数据
        for (ShoppingCart cart : list) {
            OrderDetail orderDetail = new OrderDetail();
            BeanUtils.copyProperties(cart,orderDetail); //订单明细
            orderDetail.setOrderId(orders.getId()); //设置当前订单明细关联的订单id
            orderDetailList.add(orderDetail);
        }

        orderDetailMapper.insertBatch(orderDetailList);

        //下单成功后清空用户的购物车
        shoppingCartMapper.deleteByUserId(userId);

        //封装成VO返回结果
        OrderSubmitVO orderSubmitVO=OrderSubmitVO.builder()
                .id(orders.getId())
                .orderTime(orders.getOrderTime())
                .orderNumber(orders.getNumber())
                .orderAmount(orders.getAmount())
                .build();

        return orderSubmitVO;
    }

    /**
     * 订单支付
     * @param ordersPaymentDTO
     * @return
     */
    @Override
    public Orders paySuccess(OrdersPaymentDTO ordersPaymentDTO) {

        Orders orders=Orders.builder()
                .userId(BaseContext.getCurrentId())
                .number(ordersPaymentDTO.getOrderNumber())
                .build();
        //根据订单号查询订单
        Orders myOrder= orderMapper.getByNumber(orders);

        //假设已经支付成功
        orders.setPayStatus(Orders.PAID);
        orders.setStatus(Orders.TO_BE_CONFIRMED);
        //更新订单支付状态和订单状态
        orderMapper.updatePayStatus(orders);

        //通过socket向客户端浏览器推送信息
        Map map=new HashMap<>();
        map.put("type",1);//1表示来单提醒 2表示客户催单
        map.put("orderId",myOrder.getId());
        map.put("content","订单号："+ordersPaymentDTO.getOrderNumber());

        String json = JSON.toJSONString(map);
        webSocketServer.sendToAllClient(json);
        return myOrder;
    }

    /**
     * 历史订单查询
     * @param pageNum,pageSize,status
     * @return
     */
    @Override
    public PageResult userPageQuery(int pageNum, int pageSize, Integer status) {

        //设置分页
        PageHelper.startPage(pageNum,pageSize);

        OrdersPageQueryDTO ordersPageQueryDTO = new OrdersPageQueryDTO();
        ordersPageQueryDTO.setStatus(status);
        ordersPageQueryDTO.setUserId(BaseContext.getCurrentId());

        //分页条件查询
        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

        List<OrderVO> list = new ArrayList<>();

        //查询出订单明细，封装成VO响应
        if(page != null && page.size() >0){
            for (Orders orders : page) {
                Long orderId= orders.getId();
                List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orderId);

                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders,orderVO);
                orderVO.setOrderDetailList(orderDetailList);

                list.add(orderVO);
            }
        }

        return new PageResult(page.getTotal(),list);
    }

    /**
     * 查询订单详情
     * @param id
     * @return
     */
    @Override
    public OrderVO details(Long id) {
        OrderVO orderVO =new OrderVO();
        Orders orders = orderMapper.getById(id);
        BeanUtils.copyProperties(orders,orderVO);
        List<OrderDetail> list=orderDetailMapper.getByOrderId(id);
        orderVO.setOrderDetailList(list);
        return orderVO;
    }

    /**
     * 取消订单
     * @param id
     */
    @Override
    public void userCancel(Long id) {
        //订单状态，1待付款 2待接单 3已接单 4派送中 5已完成 6已取消
        Orders orders = orderMapper.getById(id);
        Integer status = orders.getStatus();

        // 校验订单是否存在
        if (orders == null) {
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }

        //待付款用户直接取消订单（无需退款）
        if(status == Orders.PAID){
            // 更新订单状态、取消原因、取消时间
            orders.setStatus(Orders.CANCELLED);
            orders.setCancelReason("用户取消");
            orders.setCancelTime(LocalDateTime.now());
            orderMapper.update(orders);

        }else{
            //已接单和派送中需要联系商家取消订单
            if (status > 2) {
                throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
            }else{
                // 待接单用户直接取消订单并且退款
                orders.setPayStatus(Orders.REFUND);
                // 更新订单状态、取消原因、取消时间
                orders.setStatus(Orders.CANCELLED);
                orders.setCancelReason("用户取消");
                orders.setCancelTime(LocalDateTime.now());
                orderMapper.update(orders);
            }

        }
    }

    /**
     * 再来一单
     * @param id
     */
    @Override
    public void repetition(Long id) {

        // 查询当前用户id
        Long userId = BaseContext.getCurrentId();

        // 根据订单id查询当前订单详情
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(id);

        // 将订单详情对象转换为购物车对象
        List<ShoppingCart> shoppingCartList = orderDetailList.stream().map(x -> {
            ShoppingCart shoppingCart = new ShoppingCart();

            // 将原订单详情里面的菜品信息重新复制到购物车对象中
            BeanUtils.copyProperties(x, shoppingCart, "id");
            shoppingCart.setUserId(userId);
            shoppingCart.setCreateTime(LocalDateTime.now());

            return shoppingCart;
        }).collect(Collectors.toList());

        // 将购物车对象批量添加到数据库
        shoppingCartMapper.insertBatch(shoppingCartList);
    }

    /**
     * 订单搜索
     * @param ordersPageQueryDTO
     * @return
     */
    @Override
    public PageResult conditionSearch(OrdersPageQueryDTO ordersPageQueryDTO) {

        PageHelper.startPage(ordersPageQueryDTO.getPage(),ordersPageQueryDTO.getPageSize());
        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

        // 部分订单状态，需要额外返回订单菜品信息，将Orders转化为OrderVO
        List<OrderVO> orderVOList = getOrderVOList(page);

        return new PageResult(page.getTotal(),orderVOList);
    }

    /**
     * 各个状态订单量统计
     * @return
     */
    @Override
    public OrderStatisticsVO statistics() {
        // 根据状态，分别查询出待接单、待派送、派送中的订单数量
        Integer toBeConfirmed = orderMapper.countStatus(Orders.TO_BE_CONFIRMED);
        Integer confirmed = orderMapper.countStatus(Orders.CONFIRMED);
        Integer deliveryInProgress = orderMapper.countStatus(Orders.DELIVERY_IN_PROGRESS);

        //数据封装返回
        OrderStatisticsVO orderStatisticsVO = new OrderStatisticsVO();
        orderStatisticsVO.setToBeConfirmed(toBeConfirmed);
        orderStatisticsVO.setConfirmed(confirmed);
        orderStatisticsVO.setDeliveryInProgress(deliveryInProgress);

        return orderStatisticsVO;
    }

    /**
     * 接单
     * @param ordersConfirmDTO
     */
    @Override
    public void confirm(OrdersConfirmDTO ordersConfirmDTO) {
        Orders orders = new Orders();
        orders.setId(ordersConfirmDTO.getId());
        orders.setStatus(Orders.CONFIRMED);
        orderMapper.update(orders);
    }

    /**
     * 拒单
     * @param ordersRejectionDTO
     */
    @Override
    public void rejection(OrdersRejectionDTO ordersRejectionDTO) {
        Orders orders = new Orders();
        //取消订单
        orders.setId(ordersRejectionDTO.getId());
        orders.setStatus(Orders.CANCELLED);
        //取消原因
        orders.setCancelReason(ordersRejectionDTO.getRejectionReason());
        //退款
        orders.setPayStatus(Orders.REFUND);
        orderMapper.update(orders);
    }

    /**
     * 商家取消订单
     * @param ordersCancelDTO
     */
    @Override
    public void cancel(OrdersCancelDTO ordersCancelDTO) {

        Orders ordersDB = orderMapper.getById(ordersCancelDTO.getId());

        Integer status = ordersDB.getStatus();

        if(status == 1){
            Orders orders = new Orders();
            //取消订单
            orders.setId(ordersCancelDTO.getId());
            orders.setStatus(Orders.CANCELLED);
            orders.setCancelReason(ordersCancelDTO.getCancelReason());
            orders.setCancelTime(LocalDateTime.now());
            orderMapper.update(orders);
        }else{
            Orders orders = new Orders();
            //取消订单
            orders.setId(ordersCancelDTO.getId());
            orders.setStatus(Orders.CANCELLED);
            //退款
            orders.setPayStatus(Orders.REFUND);
            orders.setCancelReason(ordersCancelDTO.getCancelReason());
            orders.setCancelTime(LocalDateTime.now());
            orderMapper.update(orders);
        }

    }

    /**
     * 派送订单
     * @param id
     */
    @Override
    public void delivery(Long id) {
        Orders ordersDB = orderMapper.getById(id);
        //订单状态，1待付款 2待接单 3已接单 4派送中 5已完成 6已取消
        //已接单的可派送
        if(ordersDB.getStatus() == 3){
            Orders orders = new Orders();
            //更新订单状态派送中
            orders.setId(id);
            orders.setStatus(Orders.DELIVERY_IN_PROGRESS);
            orderMapper.update(orders);
        }
    }

    /**
     * 完成订单
     * @param id
     */
    @Override
    public void complete(Long id) {
        Orders ordersDB = orderMapper.getById(id);
        //订单状态，1待付款 2待接单 3已接单 4派送中 5已完成 6已取消
        //已接单的可派送
        if(ordersDB.getStatus() == 4){
            Orders orders = new Orders();
            //更新订单状态派送中
            orders.setId(id);
            orders.setStatus(Orders.COMPLETED);
            orderMapper.update(orders);
        }
    }

    /**
     * 用户催单
     * @param id
     */
    @Override
    public void reminder(Long id) {
        //根据id查询订单
        Orders orders = orderMapper.getById(id);

        if(orders == null){
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }

        Map map = new HashMap<>();
        map.put("type",2);//2客户催单
        map.put("orderId",orders.getId());
        map.put("content","订单号："+orders.getNumber());

        webSocketServer.sendToAllClient(JSON.toJSONString(map));
    }

    private List<OrderVO> getOrderVOList(Page<Orders> page){
        //需要返回菜品信息，OrderVO
        List<OrderVO> orderVOList = new ArrayList<>();

        List<Orders> ordersList = page.getResult();

        if(!CollectionUtils.isEmpty(ordersList)){
            for (Orders orders : ordersList) {
                //共同字段复制到OrderVO
                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders,orderVO);
                String orderDishes = getOrderDishesStr(orders);

                //将订单菜品信息封装到orderVO中，并且添加到List
                orderVO.setOrderDishes(orderDishes);
                orderVOList.add(orderVO);
            }
        }
        return orderVOList;
    }

    /**
     * 根据订单id获取菜品信息字符串
     * @param orders
     * @return
     */
    private String getOrderDishesStr(Orders orders){
        //查询订单菜品详情
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orders.getId());

        //将每一条订单菜品信息拼接为字符串（格式：宫保鸡丁*3；）
        List<String> orderDetailListStr = orderDetailList.stream().map(x -> {
                String orderDish = x.getName() + "*" + x.getNumber();
                return orderDish;
        }).collect(Collectors.toList());

        // 将该订单对应的所有菜品信息拼接在一起
        return String.join("",orderDetailListStr);
    }

}
